How to get files on root folder drive PHP MS Graph SDK

It can be easy question but the documentation is not clear or has a bug.
When you want to get files from known folder, this is the way:

GET /drives/{drive-id}/items/{item-id}/children

<?php
use Microsoft\Graph\GraphServiceClient;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$result = $graphServiceClient->drives()->byDriveId('drive-id')->items()->byDriveItemId('driveItem-id')->children()->get()->wait();

you have a DriveId and DriveItemdId, and then you ask files…
But if you want the files from root folder of drive, the url is the following:

GET /me/drive/root/children

But, Could you tell me how it is with PHP SDK? Because the documentation show the other, how if you known the folder Id.
This is url of documentation:
https://learn.microsoft.com/en-us/graph/api/driveitem-list-children?view=graph-rest-1.0&tabs=php

Thank you

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